2 Answers
2

‘She sees him not so much as her uncle as her friend’ is a perfectly normal English sentence. So, too, is ‘He is not so much her friend as her uncle’. If you want to insert he is between as and her uncle, you can, but it's not necessary.

What you propose would change the meaning of the sentence. not so much this as that is different from not as this but as that, the first mitigates while the second opposes.
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BenjaminJan 2 '12 at 18:37

@Benjamin: Okay, depending on context that might change the meaning. Still, I'd rather write, "She sees him not so much as her uncle but rather as her friend."
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JayJan 3 '12 at 5:40